Vehicle body front part structure

Description

[0001] The present invention relates to a front part structure of an automobile vehicle body including a pair of right and left front side frames each having a compressive load bearing frame member for supporting an axial load acting in a longitudinal direction of the vehicle body.

[0002] Various vehicle body front part structures of the type concerned are known and used heretofore. According to one example shown in Japanese Patent Laid-open Publication (JP-A) No. 2006-290311 which corresponds to US 2006/0232104 A, a vehicle body front part structure includes a pair of right and left front side frames as main components thereof, and each of the right and left front side frames has an axial load receiving member (hereinafter referred to as "compressive load bearing frame member") extending in a longitudinal direction of the vehicle body, and a moment receiving member (hereinafter referred to as "bending load bearing frame member") curved inwardly of the vehicle body as extending rearwardly of the vehicle body.

[0003] According to the vehicle body front part structure shown in JP 2006-290311 A), the compressive load bearing frame member configured to extend in the longitudinal direction of the vehicle body is able to bear or sustain a load acting in a direction from the front toward the rear of the vehicle body. Furthermore, the bending load bearing frame member branched from a longitudinally central portion of the compressive load bearing frame member and curved inwardly of the vehicle body as extending rearwardly of the vehicle body is able to bear or sustain a load acting in a lateral or widthwise inward direction of the vehicle body.

[0004] The compressive load bearing frame member has a rear end portion connected or joined to a front end portion of a floor frame. In the case where the floor frame is offset relative to the compressive load bearing frame member in a lateral inward direction of the vehicle body, the rear end portion of the compressive load bearing frame member is curved inwardly of the vehicle body for connection or joining with the front end portion of the floor frame. The thus curved rear end portion of the compressive load bearing frame member has a rigidity, which is insufficient to sustain an axial load acting in the longitudinal direction of the vehicle body. Accordingly, when the front side frame is subjected to a front collision input, the compressive load bearing frame member as a whole is rendered practically impossible to sustain an axial load resulting from the front collision input.

[0005] US 2006/232104 A1 discloses a front part structure of a vehicle body in accordance with the preamble of claim 1.

[0006] EP 1 897 787 A1 discloses to provide reinforcing beads 5 on the sidewalls 21s of the comprehensive load bearing frame member 21 having a generally U-shaped cross section.

[0007] It is accordingly an object of the present invention to provide a vehicle body front part structure including a front side frame having a compressive load bearing frame member which is connectable to a floor frame and has a rigidity sufficient to sustain an axial load acting thereto during a front collision even when the floor frame is offset from the compressive load bearing frame member toward a longitudinal centerline of the vehicle body.

[0008] According to the present invention, there is provided a front part structure of a vehicle body having a pair of right and left side frames, each of the front side frames comprising: a compressive load bearing frame member extending in a longitudinal direction of the vehicle body and having a generally U-shaped cross section opening in a lateral inward direction or a lateral outward direction of the vehicle body, the compressive load bearing frame member of the U-shaped cross section having a pair of upper and lower walls and a sidewall extending between the upper and lower walls; and a bending load bearing frame member branched from a longitudinally central portion of the compressive load bearing frame member and curved inwardly toward a longitudinal centerline of the vehicle body as extending rearwardly of the vehicle body, the bending load bearing frame member having a generally U-shaped cross section opening in the lateral inward direction or the lateral outward direction of the vehicle body, wherein the compressive load bearing frame member has a rear end portion curved inwardly toward the longitudinal centerline of the vehicle body, and at least one first reinforcement bead formed on the sidewall of the rear end portion of the compressive load bearing frame member and extending in the longitudinal direction of the vehicle body.

[0009] With this arrangement, since the rear end portion of the compressive load bearing frame member is curved inwardly toward the longitudinal centerline of the vehicle body, it is readily possible to connect the rear end portion of the compressive load bearing frame member to a floor frame even when the floor frame is offset toward the longitudinal centerlines of the vehicle body with respect to the compressive load bearing frame member. Furthermore, by virtue of the reinforcement bead formed on the sidewall of the inwardly curved rear end portion of the compressive load bearing frame member, the inwardly curved rear end portion becomes highly rigid enough to withstand an axial load applied thereto.

[0010] The compressive load bearing frame member further has at least one second reinforcement bead formed on a portion of the sidewall located forwardly of the longitudinal central portion of the compressive load bearing frame member, the second reinforcement bead ex-tending in the longitudinal direction of the vehicle body. The second reinforcement bead further increases the rigidity of the compressive load bearing frame member.

[0011] Preferably, each of the front side frames further comprises a cover frame member connected to the compressive load bearing frame member so as to close an open end of the U-shaped cross section of the compressive load bearing frame member to thereby form a closed cross section between the cover frame member and the compressive load bearing frame member, and wherein the cover frame member has at least one third reinforcement bead arranged face to face with the first reinforcement bead. In an assembled condition, a closed cross section is formed between the cover frame member and the compressive load bearing frame member, the rigidity of the compressive load bearing frame member increases further. Furthermore, the face-to-face arrangement of first and third reinforcement beads further increases the rigidity of the inwardly curved rear end portion of the compressive load bearing frame member.

[0012] The bending load bearing frame member of the U-shaped cross section may further have at least one fourth reinforcement bead formed on a sidewall thereof and extending in the longitudinal direction of the vehicle body. Preferably, the first reinforcement bead and the fourth reinforcement bead are arranged face to face with each other. By thus providing the fourth reinforcement bead, it is possible to increase the rigidity of the bending load bearing frame member and hence reduce an extent to which the inwardly curved bending load bearing frame portion projects in a direction toward the longitudinal centerline of the vehicle body By thus reducing the inwardly projecting extent or amount of the bending load bearing frame member, it is possible to enlarge an internal space of the engine room, which will provide an increased degree of design freedom. The bending load bearing frame member .. having a reduced inwardly projecting amount achieves a reduction in weight of the vehicle body front part structure.

[0013] In one preferred form of the invention, the vehicle body front part structure further includes a floor frame having a front end portion connected to a rear end portion of each of the front side frames, wherein the rear end portion of the compressive load bearing frame member is downwardly curved, and said at least one first reinforcement bead comprises a pair of upper and lower first reinforcement beads extending obliquely downward toward the front end portion of the floor frame and longitudinally aligned with upper and lower ends, respectively, of the front end portion of the floor frame. Preferably, the lower first reinforcement bead has an angle of inclination greater than an angle of inclination of the upper first reinforcement bead. The cover frame member has a pair of upper and lower third reinforcement beads arranged face to face with the pair of upper and lower first reinforcement beads, respectively. The bending load bearing frame member has a pair of upper and lower fourth reinforcement beads formed on the sidewall thereof in face to face arrangement with the pair of upper end lower first reinforcement beads on the compressive load bearing frame member. This arrangement provides a highly efficient reinforcement to the curved rear end portion of the compressive load bearing frame member.

[0014] Preferably, the vehicle body front part structure includes an adapter disposed on a rear end portion of each of the front side frames, and a floor frame having a front end portion connected via the adapter to the rear end portion of each of the front side frames. The adapter increases the coupling strength between the front side frame and the floor frame.

[0015] The vehicle body front part structure may further include a sub-frame disposed below the front side frames and connected to the front side frames, and a stiffener disposed on each of the front side frame for reinforce a portion of the front side frame to which the sub-frame is connected.

[0016] One preferred structural embodiment of the present invention will be described in detail herein below, by way of example only, with reference to the accompanying sheets of drawings, in which:

FIG. 1 is a side view of a vehicle body front part structure according to a preferred embodiment of the present invention;

FIG. 2 is a plan view, with parts omitted for clarity, of the vehicle body front part structure;

FIG. 3 is a perspective view of a right front side frame and a right floor frame of the vehicle body front part structure;

FIG. 4 is an exploded perspective view of FIG. 3;

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is an exploded cross-sectional view of the front side frame shown in FIG. 5;

FIG. 7 is an exploded plan view of the front side frame;

FIG. 8 is a view in the direction of the arrow 8 in FIG. 7;

FIG. 9 is a view in the direction of the arrow 9 in FIG. 7;

FIG. 10 is a view in the direction of the arrow 10 in FIG. 7;

FIG. 11 is an enlarged exploded perspective view of a portion of FIG. 4; and

FIG. 12 is a diagrammatical view illustrative of the manner in which the vehicle body front part structure is subjected to a load acting from the front side of the vehicle body.

[0017] Referring now to the drawings and FIGS. 1 and 2 in particular, there is shown a vehicle body front part structure 10 according to a referred embodiment of the present invention. The vehicle body front part structure 10 generally comprises a pair of right and left front side frames 11, 11 extending in a longitudinal direction of the vehicle body, a bumper beam 12 connected to front end portions 11a, 11a of the front side frames 11, 11 and extending in a widthwise direction of the vehicle body, a pair of right and left adapters 14, 14 disposed at rear end portions 11b, 11b of the right and left front side frames 11, 11, respectively, a pair of right and left floor frames 16, 16 connected via the adapters 14, 14 to the rear end portions 11b, 11b of the right and left front side frames 11, 11, respectively, a pair of right and left stiffeners 18, 18 for reinforcing the right and left front side frames 11, 11, respectively, and a sub-frame 21 disposed below the right and left front side frames 11, 11. In FIG. 2, the sub-frame 21 is not shown for clarity.

[0018] As shown in FIG. 1, the sub-frame 21 is connected to the right and left front side frames 11 and the right and left floor frames 16 via a sub-frame attachment means 22. The sub-frame attachment means 22 includes a pair of right and left front sub-frame attachment members 23 (only the right member being shown) extending vertically downward from the front end portions 11a of the front side frames 11, a pair of right and left central sub-frame attachment members 24 (only the right member being shown) provided on the rear end portions 11b of the front side frames 11, and a pair of right and left rear sub-frame attachment members 25 (only the right member being shown) provided on front end portions 16a of the floor frames 16.

[0019] The right front, central and rear sub-frame attachment members 23, 24 an 25 and the left front, central and rear sub-frame attachment members 23, 24 and 25 are symmetrical with each other about a longitudinal centerline 20 (FIG. 2) of the vehicle body, and only the right attachment members 23-25 are shown in FIG. 1. The sub-frame 21 is attached to the right and left front sub-frame attachment members 23, the right and left central sub-frame attachment members 24, and the right and left rear sub-frame attachment members 25, so that the sub-frame 21 is supported below the right and left front side frames 11 by the sub-frame attachment means 22.

[0020] The central sub-frame attachment members 24 are provided on the stiffeners 18, respectively. The stiffeners 18 are members that are provided to reinforce the associated front side frames 11.

[0021] The right and left front side frames 11, the right and left adapters 14, the right and left floor frames 16, and right and left stiffeners 18 in each pair are symmetrical with each other along the longitudinal centerline 20 (FIG. 2) of the vehicle body and a following description will be limited to those members 11, 14, 16 and 18 which are disposed on the right-side of the vehicle body.

[0022] As shown in FIG. 3, the right front side frame 11 is a main or skeletal component of the vehicle body front part structure 10 and generally comprises a compressive load bearing frame member 31 extending in the longitudinal direction of the vehicle body, a cover frame member 32 disposed on a lateral outer side of the compressive load bearing frame member 31, and a bending load bearing frame member 33 disposed on a lateral inner side of the compressive load bearing frame member 31. The right front side frame 11 has a downwardly curved portion 28 formed at a rear end part thereof. The downwardly curved portion 28 is configured to curve in a downward direction toward the right floor frame 16 so that the rear end portion 11b of the right front side frame T1 can be connected to the right floor frame 16 via the right adapter 14.

[0023] Referring next to FIGS. 4 to 6, structural details of the right front side frame 11 will be described. The compressive load bearing frame member 31 extends in the longitudinal direction of the vehicle body, as described above. As shown in FIG. 5, the compressive load bearing frame member 31 has a generally U-shaped cross section opening in a lateral or widthwise outward direction of the vehicle body and having an upper wall 35, a lower wall 36 and a sidewall 37 extending vertically between the upper and lower walls 35 and 36. The compressive load bearing frame member 31 further has an upper vertical flange 38 ending upwardly from a longitudinal edge of the upper wall 35, and a lower vertical flange 39 extending downwardly from a longitudinal edge of the lower wall 36.

[0024] As shown in FIG. 4, the compressive load bearing frame member 31 has a downwardly curved portion 41 at a rear end part thereof, and a pair of vertically spaced reinforcement beads 48 and 49 formed on the downwardly curved portion 41. The downwardly curved portion 41 is configured to curve in a downward direction toward the front end portion 16a of the right floor frame 16. With the downwardly curved portion 41 thus provided, a rear end portion 31a of the compressive load bearing frame member 31 can be connected via the right adapter 14 to the front end portion 16a of the right floor frame 16.

[0025] The compressive load bearing frame member 31 has an upper ridge line 42 formed by the upper wall 35 and the sidewall 37 and a lower ridge line 43 formed by the lower wall 36 and the sidewall 37. As shown in FIG. 4, the upper and lower ridge lines 42, 43 extend in the longitudinal direction of the vehicle body, so that an axial load acting in a direction from the front to the rear of the vehicle body can be born or sustained by the compressive load bearing frame member 31 (and, more particularly, by the upper and lower ridges 42, 43 of the compressive load bearing frame member 31). The compressive load bearing frame member 31 may be also referred to as an axial load receiving member that receives the axial load acting in a front-to-rear direction of the vehicle.

[0026] The reinforcement beads 48, 49 are provided on the downwardly curved portion 41 of the compressive load bearing frame member 31 for a reason discussed below. As shown in FIG- 2, with respect to the compressive load bearing frame member 31, the right floor frame 16 is offset in a lateral inward direction toward the longitudinal centerline 20 of the vehicle body by a distance D. In view of this, as shown in FIG. 7, the downwardly curved portion (rear end portion) 41 of the compressive load bearing frame member 31 is inwardly curved toward the longitudinal centerline 20 of the vehicle body so that the curved rear end portion 41 can be connected to the right floor frame 16.

[0027] More concretely, the downwardly curved portion 41 of the compressive load bearing frame member 31 is slightly curved toward the longitudinal centerline 20 (FIG. 2) with a radius of R. By thus forming the downwardly curved portion 41 of the compressive load bearing frame member 31, the rear end portion 31a of the compressive load bearing frame member 31 can be connected via the right adapter 14 to the front end portion 16a of the right floor frame 16 shown in FIG. 4.

[0028] However, by thus curving the downwardly curved portion 41 of the compressive load bearing frame member 31 toward the longitudinal centerline 20 (FIG. 2) of the vehicle body, it becomes difficult for the downwardly curved portion 41 to maintain a sufficient rigidity against an axial load acting in a direction from the front to the rear of the vehicle body. To deal with this problem, the reinforcement beads 48, 49 are provided on the downwardly curved portion 41 (FIG. 4).

[0029] As shown in FIG. 8 which is a view in the direction of the arrow 8 in FIG. 7, the upper reinforcement bead 48 is disposed on the sidewall 37 of the downwardly curved portion 41 adjacent to the upper wall 35 and formed to extend along an upper oblique line 63, which extends obliquely downward in a rearward direction of the vehicle body. The upper oblique line 63 is set to pass through an upper end 16b of the front end portion 16a of the right floor frame 16. Thus, the upper reinforcement bead 48 extends obliquely downward toward the front end portion 16a of the floor frame 16 and is longitudinally aligned with the upper end 16b of the front end portion 16a of the right floor frame 16. As shown in FIG- 5, the upper reinforcement bead 48 projects toward the longitudinal centerline 20 (FIG. 2) of the vehicle body.

[0030] The lower reinforcement bead 49 is disposed on the sidewall 37 of the downwardly curved portion 41 adjacent to the lower wall 36 and formed to extend along a lower oblique line 64, which extends obliquely downward in a rearward direction of the vehicle body. The lower oblique line 64 is set to passes through a lower end 16c of the front end portion 16a of the right floor frame 16 and has an angle of inclination which is larger than an angle of inclination of the upper oblique line 63. Thus, the lower reinforcement bead 49 extends obliquely downward toward the front end portion 16a of the floor frame 16 and is longitudinally aligned with the lower end 16c of the front end portion 16a of the right floor frame 16. The lower reinforcement bead 49 has a larger angle of inclination than the upper reinforcement bead 48. As shown in FIG- 5, the lower reinforcement bead 49 also projects toward the longitudinal centerline 20 (FIG. 2) of the vehicle body.

[0031] With this arrangement, when the downwardly curved portion 41 is subjected to a load F1 acting from the front of the vehicle body, the load F1 is transmitted from the downwardly curved portion 41 of the compressive load bearing frame member 31 to the right floor frame 16 as indicated by the arrow F1 shown in FIG. 8. Since the upper reinforcement bead 48 is longitudinally aligned with the upper end 16b of the front end portion 16a of the floor frame 16 and the lower reinforcement bead 49 is longitudinally aligned with the lower end 16c of the front end portion 16a of the floor frame 16 (namely, because the upper and lower reinforcement beads 48, 49 are longitudinally aligned with the front end portion 16a of the floor frame 16), the upper end lower reinforcement beads 48, 49 extend along a transfer direction of the load F1. With the reinforcement beads 48, 49 thus provided, the downwardly curved portion 41 now possesses a rigidity, which is large enough to sustain the load F1.

[0032] The compressive load bearing frame member 31 further has another pair of vertically spaced reinforcement beads 69 and 70 formed on the sidewall 37 at a portion located forwardly of the downwardly curved portion 41. In the illustrated embodiment, the reinforcement beads 69, 70 are located forwardly of the longitudinally central portion 31c of the compressive load bearing frame member 31. The upper reinforcement bead 69 extends substantially horizontally along the longitudinal direction of the compressive load bearing frame member 31 and projects toward the longitudinal centerline 20 (FIG. 2) in the same manner as the upper reinforcement bead 48. The lower reinforcement bead 70 is disposed below the upper reinforcement bead 69 and extends substantially horizontally along the longitudinal direction of the compressive load bearing frame member 31. Like the lower reinforcement bead 49, the lower reinforcement bead 70 projects toward the longitudinal centerline 20 (FIG. 2) of the vesicle body. The upper and lower reinforcement beads 69, 70 further increase the rigidity of the compressive load bearing frame member 31 against the load F1 acting from the front of the vehicle body.

[0033] Referring back to FIGS. 4 to 6, the cover frame member 32 is an elongated strip-like plate member extending in the longitudinal direction of the vehicle body. The cover frame member 32 has an upper longitudinal edge portion 45 welder to the upper vertical flange 38 of the compressive load bearing frame member 31, and a lower longitudinal edge portion 46 welded to the lower vertical flange 39 of the compressive load bearing frame member 31. By thus welding the cover frame member 32 to the compressive load bearing frame member 31, an open end 44 (FIGS. 5 and 6) of the U-shaped cross section of the compressive load bearing frame member 31 is closed by the cover frame member 32, and a closed cross section is formed by and between the cover frame member 32 and the compressive load bearing frame member 31.

[0034] The cover frame member 32 has a downwardly curved portion 47 (FIG. 4) at a rear end part thereof, and a pair of vertically spaced outer reinforcement beads 76 and 77 formed on the downwardly curved portion 47. The downwardly curved portion 47 is configured to curve in a downward direction toward the front end portion 16a-of the right floor frame 16. With the downwardly curved portion 47 thus provided, a rear end portion 32a of the cover frame member 32 can be connected via the right adapter 14 to the front end portion 16a of the right floor frame 16.

[0035] As shown in FIG. 9 which is a view in the direction of the arrow 9 in FIG. 7, the upper outer reinforcement bead 76 is disposed on a substantially central part of the downwardly curved portion 47 adjacent to the upper longitudinal edge portion 45 of the cover frame member 32 and formed to extend along an upper oblique line 78, which extends obliquely downward in a rearward direction of the vehicle body. The upper outer reinforcement bead 76 is arranged face to face with the upper reinforcement bead 48 (FIG. 8) in the lateral or widthwise direction of the vehicle body (see PIG. 5). The upper oblique line 78 is set to pass through the upper end 16b of the front end portion 16a of the right floor frame 16. Thus, the upper outer reinforcement bead 76 extends obliquely downward toward the front end portion 16a of the right floor frame 16 and is longitudinally aligned with the upper end 16b of the front end portion 16a of the right floor frame 16. As shown in FIG. 5, the upper outer reinforcement bead 76 projects toward the longitudinal centerline 20. (FIG. 2) of the vehicle body.

[0036] The lower outer reinforcement bead 77 is disposed on a substantially central part of the downwardly curved portion 47 adjacent to the lower longitudinal edge portion 46 of the cover frame member 32 and formed to extend along a lower oblique line 79, which extends obliquely downward in a rearward direction of the vehicle body. The lower outer reinforcement bead 77 is arranged face to face with the lower reinforcement bead 49 (FIG. 8) in the lateral or widthwise direction of the vehicle body (see FIG. 5). The lower oblique line 79 is set to passes through the lower end 16c of the front end portion 16a of the right floor frame 16 and has an angle of inclination larger than that of the upper oblique line 78. Thus, the lower outer reinforcement bead 77 extend obliquely downward toward the front end portion 16a of the right floor frame 16 and is longitudinally aligned with the lower end 16c of the front end portion 16a of the right floor frame 16. As shown in FIG. 5, the lower outer reinforcement bead 77 also projects toward the longitudinal centerline 20 (FIG. 2) of the vehicle body.

[0037] With this arrangement, when the cover frame member 32 is subjected to a load F1 acting from the front of the vehicle body, the load F1 is transmitted to the right floor frame 16 as indicated by the arrow F1 shown in FIG. 7. Since the upper outer reinforcement bead 76 is longitudinally aligned with the upper end 16b of the front end portion 16a of the floor frame 16 and the lower outer reinforcement bead 77 is longitudinally aligned with the lower end 16c of the front end portion 16a or the floor frame 16 (namely, because the upper and lower outer reinforcement beads 76, 77 are longitudinally aligned with the front end portion 16a of the floor frame 16), the upper and lower outer reinforcement beads 76, 77 extend along a transfer direction of the load F1. By thus providing the outer reinforcement beads 76, 77 on the downwardly curved portion 47, the cover frame member 32 is highly rigid to withstand the load F1.

[0038] The thus reinforced cover frame member 32 is welded to the compressive load bearing frame member 31 (FIG. 8) so as to close the open end 44 of the U-shaped cross section of the compressive load bearing frame member 31, and a closed cross section is formed by and between the cover frame member 32 and the compressive load bearing frame member 31, as shown in FIG. 5. With this arrangement, the downwardly curved portion 47 of the cover frame member 32 that is reinforced with the outer reinforcement beads 76, 77 further increases the rigidity of the downwardly curved portion 41 of the compressive load bearing frame member 31.

[0039] . Referring back to FIGS. 4 to 6, structural details of the bending load bearing frame member 33 will be described. The bending load bearing frame member 33 has a generally U-shaped cross section opening in a lateral or widthwise outward direction of the vehicle body and having an upper wall 51, a lower wall 52 (FIGS. 5 and 6) and a sidewall 53 extending vertically between the upper and lower walls 51 and 52. The bending load bearing frame member 33 further has an upper vertical flange 54 extending upwardly from a longitudinal edge of the upper wall 51, and a lower vertical flange 55 extending downwardly from a longitudinal edge of the lower wall 52.

[0040] As shown in FIG. 6, the right stiffener 18 formed from an angle plate 19 of an L-shaped cross section having a vertical wall 121 joined by welding to the sidewall 53 of the bending load bearing frame member 33 and a horizontal wall 122 joined by welding to the lower wall 52 of the bending load bearing frame member 33. The thus welded stiffener 18 reinforces a portion of the front side frame 11 to which the sub-frame 21 (FIG. 1) is attached.

[0041] As shown in FIG. 4, the bending load bearing frame member 33 has a downwardly curved portion 48 at a rear end part thereof, and a pair of vertically spaced inner reinforcement beads 95 and 96 formed on the downwardly curved portion 48. The downwardly curved portion 48 is configured to curve in a downward direction toward the front end portion 16a of the right floor frame 16. With the downwardly curved portion 48 thus provided, a rear end portion 33a of the bending load bearing frame member 33 can be connected via the right adapter 14 to the front end portion 16a of the right floor frame 16.

[0042] The bending lad bearing frame member 33 is wrapped over a rear longitudinal half or section 31b of the compressive load bearing frame member 31 and welded to the compressive load bearing fame member 31. In the welded or assembled condition, an open end 59 of the U-shaped cross section of the bending load bearing frame member 33 is closed by and between the compressive load bearing frame member 31, and a closed cross section is formed by the compressive load bearing frame member 31 and the bending load bearing frame member 33.

[0043] The bending load bearing frame member 33 has an upper ridge line 61 formed by the upper wall 51 and the sidewall 53 and a lower ridge line 62 formed by the lower wall 52 and the sidewall 53. The bending load bearing frame member 33 has a front end portion 33b disposed on a longitudinally central portion 31c of the compressive load bearing frame member 31 and is curved inwardly of the vehicle body toward the longitudinal centerline 20 (FIG. 2) of the vehicle body as extending from the front end portion 33b toward the rear end portion 33a (namely, as extending rearwardly of the vehicle body). Thus, the upper and lower ridge lines 61, 62 curve inwardly of the vehicle body toward the longitudinal centerline 20 (FIG. 2) as extending from the longitudinally central portion 31c of the compressive load bearing frame member 31 in a rearward direction of the vehicle body.

[0044] With this arrangement, a bending moment produced due to a load acting on the front end of the vehicle body in a direction toward the longitudinal centerline 20 (FIG. 2) of the vehicle body can be born or sustained mainly by the curved upper and lower ridge lines 61 and 62 of the bending load bearing frame member 33. Thus, the bending load bearing frame member may be also referred to as a moment receiving member that receives a bending moment.

[0045] As shown in FIG. 10 which is a view in the direction of the arrow 10 in FIG. 7, the upper inner reinforcement bead 95 is disposed on the sidewall 53 of the downwardly curved portion 58 adjacent to the upper wall 51 and formed to extend along an upper oblique line 97, which extends obliquely downward in a rearward direction of the vehicle body. The upper inner reinforcement bead 95 extends obliquely downward at a alight angle of inclination toward the front end portion 16a of the right floor frame 16. As shown in FIG. 5, the upper inner reinforcement bead 95 projects in a lateral outward direction which is opposite to a projecting direction of the upper reinforcement bead 48 of the compressive load bearing frame member 31.

[0046] The lower inner reinforcement bead 96 is disposed on the sidewall 53 of the downwardly curved portion 58 adjacent to the lower wall 52 and located directly below the upper inner reinforcement bead 96. The lower inner reinforcement bead 96 extends along a lower oblique line 98, which extend obliquely downward toward a rearward direction of the vehicle body. The lower oblique line 98 is parallel to the upper oblique line 97. The upper and lower inner reinforcement beads 95, 96 have an angle of inclination which is much smaller than angles of inclination of the first and third reinforcement beads 48, 49 and 76, 77. As shown in FIG. 5, the lower inner reinforcement bead 96 projects in the lateral outward direction which is opposite to a projecting direction of the lower reinforcement bead 49 of the compressive load bearing frame member 31. The pair of upper and lower inner reinforcement beads 95, 96 on the bending load bearing frame member 33 and the pair of upper and lower reinforcement beads 48, 49 on the compressive load bearing frame member 31 are arranged substantially face to face with each other.

[0047] By virtue of the upper and lower inner reinforcement beads 95, 96 provided on the downwardly curved portion 58 and extending in the longitudinal direction of the vehicle body, the bending load bearing frame member 33 is able to bear or sustain a bending moment M1 (FIG- 2) produced in the front side frame 11. The bending moment M1 shown in FIG. 2 is a moment, which is produced when the right front side frame 11 is subjected to a load F2 acting in a lateral inward direction toward the longitudinal centerline 20 of the vehicle body.

[0048] Furthermore, by virtue of the upper and lower inner reinforcement beads 95, 96, the bending load bearing frame member 33 is made highly rigid enough to sustain the bending moment M1 and hence is able to reduce an inwardly projecting amount S (FIG. 2) of the bending load bearing frame member 33, which is curved inwardly toward the longitudinal centerline 20 (FIG. 2) of the vehicle body as extending rearwardly of the vehicle body. By thus reducing the inwardly projecting amount S of the bending load bearing frame member 33, it is possible to enlarge an internal space 99 (FIG. 22) of the engine room, which will increase the degree of design freedom of the vehicle body front part structure 10. Reducing the inwardly projecting amount S directly brings about a reduction in weight of the front side frame 11.

[0049] Referring back to FIG. 3, the right floor frame 16 is disposed rearwardly of the right front side frame 11 and forms a skeletal member of a floor 27. The right floor frame 16 is connected at the front end portion 16a thereof to the rear end portion 11b of the right front side frame 11 via the right adapter 14 and extends rearwardly of the vehicle body from the rear end portion 11b of the right front side frame 11. The right floor frame 16 has a front portion 65 extending from the front end to a longitudinally central portion of the right floor frame 16, and a rear portion 66 extending from the longitudinally central portion to the rear end of the right floor frame 16. The front portion 56 has a downward slope in the rearward direction of the vehicle body, and the rear portion 57 is disposed substantially horizontally. An outrigger 67 extends to project from the front portion 65 in a direction laterally away from the longitudinal center line 20 (FIG. 2) of the vehicle body, and a cross-member attachment portion 68a extends to projects from the rear portion 66 in a direction toward the longitudinal centerline 20 (FIG. 20) of the vehicle body for attachment of a cross-member 68 (FIG. 2) to the floor frame 16.

[0050] As shown in FIG. 11 which is an enlarged perspective view of a portion of FIG. 4, the right floor frame 16 has a generally U-shaped cross section opening in an upward direction and includes an inner sidewall 71, an outer sidewall 72 and a bottom wall 73 extending between the inner and outer sidewalls 71, 72. The right floor frame 16 further has an inner flange 74 projecting from an upper longitudinal edge of the inner sidewall 71 in a lateral inward direction toward the longitudinal centerline 20 (FIG. 2) of the vehicle body, and an outer flange 75 projecting from an upper longitudinal edge of the outer sidewall 72 in a direction laterally away from the longitudinal centerline 20 (FIG. 2) of the vehicle body.

[0051] The outer flange 75 has a front end portion 75a bent into an appropriate shape so that the bent front end portion 75a can be welded to the right adapter 14. A dashboard 81 (FIG. 1) is placed on the inner and outer flanges 74, 75 along the front part 5 65 of the right floor frame 16, and a floor panel 82 (FIG. 1) is placed on the inner and outer flanges 74, 75 along the rear part 66 of the right floor frame 16.

[0052] The front end portion 16a of the right floor frame 16 is connected or joined to the rear end portion 11b (FIG-3) of the right front side frame 11 via the right adapter 14. The right adapter 14 is press-formed from a single sheet metal into a desired configuration and includes a partition wall 84 partitioning the right front side frame 11 and the right floor frame 16, and a peripheral wall 85 extending continuously from a peripheral edge of the partition wall 84 in a direction perpendicular to the partition wall 84 and connected to the right front side frame 11 and the right floor frame 16.

[0053] The peripheral wall 85 of the right adapter 14 includes an upper joint portion 86 bent from an upper edge of the partition wall 84 in a rearward direction of the vehicle body, a lower joint portion 87 bent from a lower edge of the partition wall 84 in a rearward direction of the vehicle body, an inner joint portion 88 bent from an inner side edge of the partition wall 84 in a rearward direction of the vehicle body, and an outer joint portion 89 bent from an outer side edge of the partition wall 84 in a rearward direction of the vehicle body.

[0054] The upper joint portion 86 is joined by welding to a rear end portion 51a of the upper wall 51 of the bending load bearing frame member 33. The lower joint portion 87 is joined by welding to a rear end portion 52a of the lower wall 52 of the bending load bearing frame member 33 and a rear end portion 73a of the bottom wall 73 of the right floor frame 16. The inner joint portion 88 is joined by welding to a rear end portion 53a of the sidewall 53 of the bending load bearing frame member 33 and a front end portion 71a of the inner sidewall 71 of the right floor frame 16. The outer joint portion 89 is joined by welding to a rear end portion 37a of the sidewall 37 of the compressive load bearing frame member 31 and the rear enc portion 32a of the cover frame member 32. The outer joint portion 89 is also joined by welding to a front end portion 72a of the outer sidewall 72 of the right floor frame 16.

[0055] Operation of the vehicle body front part structure 10 of the foregoing construction will be described below with reference to FIG. 12. Upon front collision of the vehicle, an axial force of load F3 acts on the bumper beam 12 (indicated by phantom lines) as shown by a phantom-lined straight arrow. During the front collision, the bumper beam 12 yields backward to a rearward position P, as indicated by the solid lines shown in FIG. 12, under the effect of the axial load F3. The backward deformation of bumper beam 12 will produce a compressive load F4 and a bending load F5 acting via the bumper beam 12 to the front endportion 11a of the right front side frame 11.

[0056] The compressive load F4 is a load which tends to compress the right front side frame, and the bending load F5 is a load which tends to bend the right front side frame toward the longitudinal centerline 20 of the vehicle body. By the bending load F5 acting on the front end portion 11a of the right front side frame 11, a bending moment M2 is produced in the right front side frame 11 as shown by a curved arrow. In this instance, the compressive load F4 is born or sustained mainly by the upper and lower ridge lines 42, 43 of the compressive load bearing frame member 31. Since the upper and lower ridge lines 42, 43 extend in the longitudinal direction of the vehicle body and hence are able to reliably sustain the compressive load F4.

[0057] As described above with reference to FIG. 8, the compressive load bearing frame member 13 has the upper and lower reinforcement beads 48 and 49 and the upper and lower reinforcement beads 69 and 70 that are disposed forwardly of the reinforcement beads 48, 49. Furthermore, as explained previously with reference to FIG. 9, the cover frame member 32 has the upper and lower outer reinforcement beads 76 and 77. In an assembled condition, the compressive load bearing frame member 31 is reinforced by the cover frame member 32-With this reinforcement by the cover frame member 32, the compressive load bearing frame member 31 is able to sustain the compressive load F4 with improved reliability.

[0058] On the other hand, the bending moment M2 is born or sustained mainly by the upper and lower ridge lines 61 and 62 of the bending load bearing frame member 33. The upper and lower ridge lines 61, 62 are branched from the longitudinally central portion 31c of the bending load bearing frame member 33 and curved inwardly of the vehicle body toward the longitudinal centerline 20 of the vehicle body. With this configuration, the bending load bearing frame member 33 and more particularly the upper and lower ridge lines 61, 62 there are able to sustain the bending moment M2 with sufficient reliability. As discussed above with reference to FIG. 10, the bending load bearing frame member 33 has the upper and lower inner reinforcement beads 95, 96 provided to increase the rigidity of the downwardly curved portion 58. With the inner reinforcement beads 95, 96 thus provided, the bending load bearing frame member 33 is able to sustain the bending moment M2 with improved reliability.

[0059] In the illustrated embodiment, the compressive load bearing frame member 31 and the bending load bearing frame member 30 are arranged to open in a lateral or widthwise outward direction of the vehicle body- The present invention should by no means be limited to the illustrated embodiment by may include a variation in which the compressive load bearing frame member 31 and the bending load bearing frame member 30 are arranged to open toward the longitudinal centerline 20 of the vehicle body.

[0060] Furthermore, although in the illustrated embodiment, the reinforcement beads 48, 49 on the compressive load bearing frame member 31 and the outer reinforcement beads 76, 77 of the cover frame member 32 are formed to project toward the longitudinal centerline 20 of the vehicle body, while the inner reinforcement beads 95, 96 on the bending load bearing frame member 33 are formed to project in a lateral or widthwise outward direction of the vehicle body, the projecting direction of each individual reinforcement bead may be selected as appropriate.

Claims

1. A front part structure (10) of a vehicle body having a pair of right and left side frames (11, 11), each of the front side frames comprising:

a compressive load bearing frame member (31) extending in a longitudinal direction of the vehicle body and having a generally U-shaped cross section opening in a lateral inward direction or a lateral outward direction of the vehicle body, the compressive load bearing frame member of the U-shaped cross section having a pair of upper and lower walls (35, 36) and a sidewall (37) extending between the upper and lower walls; and

a bending load bearing frame member (33) branched from a longitudinally central portion (31c) of the compressive load bearing frame member and curved inwardly toward a longitudinal centerline (20) of the vehicle body as extending rearwardly of the vehicle body, the bending load bearing frame member having a generally U-shaped cross section opening in the lateral inward direction or the lateral outward direction of the vehicle body,

wherein the compressive load bearing frame member (31) has a rear end portion (41) curved inwardly toward the longitudinal centerline of the vehicle body,
characterised in that the compressive load bearing frame member (31) further has at least one first reinforcement bead (48, 49) formed on the sidewall (37) of the rear end portion of the compressive load bearing frame member (31) and extending in the longitudinal direction of the vehicle body, and
at least one second reinforcement bead (69; 70) formed on a portion of the sidewall (37) located forwardly of the longitudinal central portion (31c) of the compressive load bearing frame member (31), the second reinforcement bead (69, 70) extending in the longitudinal direction of the vehicle body.

2. The front part structure of the vehicle body according to claim 1, wherein each of the front side frames (11) further comprises a cover frame member (32) connected to the compressive load bearing frame member (31) so as to close an open end (44) of the U-shaped cross section of the compressive load bearing frame member to thereby form a closed cross section between the cover frame member and the compressive load bearing frame member, and wherein the cover frame member has at least one third reinforcement bead (76, 77) arranged face to face with the first reinforcement bead (48, 49).

3. The front part structure of the vehicle body according to claim 1 or 2, wherein the bending load bearing frame member (33) of the U-shaped cross section has a pair of upper and lower walls (51, 52) and a sidewall (53) extending between the upper and lower walls, the bending load bearing frame member further having at least one fourth reinforcement bead (95, 96) formed on the sidewall thereof and extending in the longitudinal direction of the vehicle body.

4. The front part structure of the vehicle body according to claim 3, wherein the first reinforcement bead (47, 48) and the fourth reinforcement bead (95, 96) are arranged face to face with each other.

5. The front part structure of the vehicle body according to claim 1, further including a floor frame (16) having a front end portion (16a) connected to a rear end portion (11b) of each of the front side frames (11), wherein the rear end portion (41) of the compressive load bearing frame member (31) is downwardly curved, and said at least one first reinforcement bead (48, 49) comprises a pair of upper and lower first reinforcement beads extending obliquely downward toward the front end portion of the floor frame and longitudinally aligned with 5 upper and lower ends (16b. 16c), respectively, of the front end portion of the floor frame.

6. The front part structure of the vehicle body according to claim 5, wherein the lower first reinforcement bead (49) has an angle of inclination greater than an angle of inclination of the upper first reinforcement bead (48).

7. The front part structure of the vehicle body according to claim 5, wherein each of the front side frames (11) further comprises a cover frame member (32) connected to the compressive load bearing frame member (31) so as to close an open end (44) of the U-shaped cross section of the compressive load bearing frame member to thereby form a closed cross section between the cover frame member and the compressive load bearing frame member, and whereon the cover frame member has a pair of upper and lower third reinforcement beads (76, 77) arranged face to face with the pair of upper and lower first reinforcement beads (48, 49), respectively.

8. The front part structure of the vehicle body according to one of claims 5 to 7, wherein the bending load bearing frame members (33) of the U-shaped cross section has a pair of upper and lower walls (51, 52) and a sidewall (53) extending between the upper and lower walls, the bending load bearing frame member further having a pair of upper and lower fourth reinforcement beads (95, 96) formed, on the sidewall thereof and extending in the longitudinal direction of the vehicle body.

9. The front part structure of the vehicle body according to claim 8, wherein the pair of upper and lower first reinforcement beads (47, 48) and the pair of upper and lower fourth reinforcement beads (95, 96) are arranged face to face with each other.

10. The front part structure of the vehicle body according to claim 1, further inducing an adapter (14) disposed on a rear end portion (11b) of each of the front side frames (11), and a floor frame (16) having a front end portion (16a) connected via the adapter (14) to the rear end portion (11b) of each of the front side frames (11).

11. The front part structure of the vehicle body according to claim 1, further including a sub-frame (21) disposed below the fronts side frames (11) and connected to the front side frames (11), and a stiffener (18) disposed on each of the front side frame for reinforce a portion of the front side frame to which the sub-frame is connected.

12. The front part structure of the vehicle body according to claim 1, further including a floor frame (16) having a front end portion (16a) connected to a rear, end portion (11b) of each of the front side frames (11), the floor fame having a generally U-shaped cross section including a pair of sidewalls (71, 72) and a bottom wall (73) extending between the sidewalls, wherein the sidewall (37) of the compressive load bearing frame member (31) has a rear end portion (37a) connected to a front end portion (72a) of one of the sidewalls (71, 72) of the floor frame (16) for transmission of a load therefrom to said one sidewall (72), the bending load bearing frame member (33) of the U-shaped cross section has a pair of upper and lower walls (51, 52) and a sidewall (53) extending between the upper and lower walls, the sidewall (53) of the bending load bearing frame member having a rear end portion (53a) connected to a front end portion (71a) of the other of the sidewalls (71, 72) of the floor frame (16) for transmission of a load therefrom to the other sidewall (71), and the first reinforcement bead (48, 49) of the compressive load bearing frame member (31) extending longitudinally toward said one sidewall (72) of the floor frame (16).

13. The front part structure of the vehicle body according to claim 12, wherein the bending load bearing flame member (33) has at least one reinforcement bead (95, 96) formed on the sidewall (53) thereof and extending longitudinally toward the other sidewall (71) of the floor frame (16).

Ansprüche

1. Frontteilstruktur (10) eines Fahrzeugaufbaus, die ein Paar von linken und rechten Seitenrahmen (11, 11) aufweist, wobei jeder der vorderen Seitenrahmen umfasst:

ein Kompressionslast aufnehmendes Rahmenelement (31), das sich in Längsrichtung des Fahrzeugaufbaus erstreckt und einen allgemein U-förmigen Querschnitt hat, der sich in seitlich einwärtiger Richtung oder seitlich auswärtiger Richtung des Fahrzeugaufbaus öffnet, wobei das Kompressionslast aufnehmende Rahmenelement U-förmigen Querschnitts ein Paar von oberen und unteren Wänden (35, 36) und eine Seitenwand (37), die sich zwischen den oberen und unteren Seitenwänden erstreckt, aufweist; und

ein Biegelast aufnehmendes Rahmenelement (33), das von einem Längsmittelabschnitt (31 c) des Kompressionslast aufnehmenden Rahmenelements abzweigt und sich zur Rückseite des Fahrzeugaufbaus hin erstreckend zu einer Längsmittellinie (20) des Fahrzeugaufbaus hin einwärts gekrümmt ist, wobei das Biegelast aufnehmende Rahmenelement einen allgemein U-förmigen Querschnitt hat, der sich in der seitlich einwärtigen Richtung oder der seitlich auswärtigen Richtung des Fahrzeugaufbaus öffnet,

worin das Kompressionslast aufnehmende Rahmenelement (31) einen hinteren Endabschnitt (41) aufweist, der zu der Längsmittellinie des Fahrzeugaufbaus hin einwärts gekrümmt ist,

dadurch gekennzeichnet, dass das Kompressionslast aufnehmende Rahmenelement (31) ferner zumindest einen ersten Verstärkungswulst (48, 49) aufweist, der an der Seitenwand (37) des hinteren Endabschnitts des Kompressionslast aufnehmenden Rahmenelements (31) ausgebildet ist und sich in der Längsrichtung des Fahrzeugaufbaus erstreckt, sowie zumindest einen zweiten Verstärkungswulst (69, 70), der an einem Abschnitt der Seitenwand (37) ausgebildet ist, der vor dem Längsmittelabschnitt (31 c) des Kompressionslast aufnehmenden Rahmenelements (31) angeordnet ist, wobei sich der zweite Verstärkungswulst (69, 70) in der Längsrichtung des Fahrzeugaufbaus erstreckt.

2. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1, worin jeder der vorderen Seitenrahmen (11) ferner ein Deckrahmenelement (32) aufweist, das mit dem Kompressionslast aufnehmenden Rahmenelement (31) verbunden ist, um ein offenes Ende (44) des U-förmigen Querschnitts des Kompressionslast aufnehmenden Rahmenelements zu verschließen, um hierdurch einen geschlossenen Querschnitt zwischen dem Deckrahmenelement und dem Kompressionslast aufnehmenden Rahmenelement zu bilden, und worin das Deckrahmenelement zumindest einen dritten Verstärkungswulst (76, 77) aufweist, der gegenüber dem ersten Verstärkungswulst (48, 49) angeordnet ist.

3. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1 oder 2, worin das Biegelast aufnehmende Rahmenelement (33) U-förmigen Querschnitts ein Paar von oberen und unteren Wänden (51, 52) sowie eine Seitenwand (53), die sich zwischen den oberen und unteren Wänden erstreckt, aufweist, wobei das Biegelast aufnehmende Rahmenelement ferner zumindest einen vierten Verstärkungswulst (95, 96) aufweist, der an dessen Seitenwand ausgebildet ist und sich in der Längsrichtung des Fahrzeugaufbaus erstreckt.

4. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 3, worin der erste Verstärkungswulst (47, 48) und der vierte Verstärkungswulst (95, 96) einander gegenüberliegend angeordnet sind.

5. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1, die ferner einen Bodenrahmen (16) aufweist, der einen vorderen Endabschnitt (16a) aufweist, der mit einem hinteren Endabschnitt (11b) jedes der vorderen Seitenrahmen (11) verbunden ist, wobei der hintere Endabschnitt (41) des Kompressionslast aufnehmenden Rahmenelements (31) nach unten gekrümmt ist, und der zumindest eine erste Verstärkungswulst (48, 49) ein Paar von oberen und unteren ersten Verstärkungswülsten aufweist, die sich schräg abwärts zu dem vorderen Endabschnitt des Bodenrahmens hin erstrecken und längs mit jeweiligen oberen und unteren Enden (16b, 16c) des vorderen Endabschnitts des Bodenrahmens fluchten.

6. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 5, worin der untere erste Verstärkungswulst (49) einen Neigungswinkel hat, der größer ist als ein Neigungswinkel des oberen ersten Verstärkungswulsts (48).

7. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 5, worin jeder der vorderen Seitenrahmen (11) ferner ein Deckrahmenelement (32) aufweist, das mit dem Kompressionslast aufnehmenden Rahmenelement (31) verbunden ist, um ein offenes Ende (44) des U-förmigen Querschnitts des Kompressionslast aufnehmenden Lagerelements zu verschließen, um hierdurch einen geschlossenen Querschnitt zwischen dem Deckrahmenelement und dem Kompressionslast aufnehmenden Rahmenelement zu bilden, und worin das Deckrahmenelement ein Paar von oberen und unteren dritten Verstärkungswülsten (76, 77) aufweist, die jeweils gegenüber dem Paar von oberen und unteren ersten Verstärkungswülsten (48, 49) angeordnet sind.

8. Die Frontteilstruktur des Fahrzeugaufbaus nach einem der Ansprüche 5 bis 7, worin das Biegelast aufnehmende Rahmenelement (33) U-förmigen Querschnitts ein Paar von oberen und unteren Wänden (51, 52) und eine Seitenwand, die sich zwischen den oberen und unteren Wänden erstreckt, aufweist, wobei das Biegelast aufnehmende Rahmenelement ferner ein Paar von oberen und unteren vierten Verstärkungswülsten (95, 96) aufweist, die an dessen Seitewand ausgebildet sind und sich in der Längsrichtung des Fahrzeugaufbaus erstrecken.

9. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 8, worin das Paar von oberen und unteren ersten Verstärkungswülsten (47, 48) und das Paar von oberen und unteren vierten Verstärkungswülsten (95, 96) einander gegenüberliegend angeordnet sind.

10. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1, die ferner einen Adapter (14) enthält, die an einem hinteren Endabschnitt (11b) jedes der vorderen Seitenrahmen (11) angeordnet ist, sowie einen Bodenrahmen (16), der einen vorderen Endabschnitt (16a) aufweist, der über den Adapter (14) mit dem hinteren Endabschnitt (11b) jedes der vorderen Seitenrahmen (11) verbunden ist.

11. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1, die ferner einen Hilfsrahmen (21) enthält, der unter den vorderen Seitenrahmen (11) angeordnet ist und mit den vorderen Seitenrahmen (11) verbunden ist, sowie eine Versteifung (18), die an jedem der vorderen Seitenrahmen angeordnet ist, um einen Abschnitt des vorderen Seitenrahmens, mit dem der Hilfsrahmen verbunden ist, zu verstärken.

12. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 1, die ferner einen Bodenrahmen (16) enthält, der einen vorderen Endabschnitt (16a) aufweist, der mit einem hinteren Endabschnitt (11b) jedes der vorderen Seitenrahmen (11) verbunden ist, wobei der Bodenrahmen einen allgemein U-förmigen Querschnitt aufweist, der ein Paar von Seitenwänden (71, 72) und eine sich zwischen den Seitenwänden erstreckende Bodenwand (73) enthält, wobei die Seitenwand (37) des Kompressionslast aufnehmenden Rahmenelements (31) einen hinteren Endabschnitt (37a) aufweist, der mit einem vorderen Endabschnitt (72a) einer der Seitenwände (71, 72) des Bodenrahmens (16) verbunden ist, um eine Last von dort auf die eine Seitenwand (72) zu übertragen, wobei das Biegelast aufnehmende Rahmenelement (33) U-förmigen Querschnitts ein Paar von oberen und unteren Wänden (51, 52) und eine sich zwischen den oberen und unteren Wänden erstreckende Seitenwand (53) aufweist, wobei die Seitenwand (53) des Biegelast aufnehmenden Rahmenelements einen hinteren Endabschnitt (53a) aufweist, der mit einem vorderen Endabschnitt (71 a) der anderen der Seitenwände (71, 72) des Bodenrahmens (16) verbunden ist, um eine Last von dort auf die andere Seitenwand (71) zu übertragen, und sich der erste Verstärkungswulst (48, 49) des Kompressionslast aufnehmenden Rahmenelements (31) längs zu der einen Seitenwand (72) des Bodenrahmens (16) hin erstreckt.

13. Die Frontteilstruktur des Fahrzeugaufbaus nach Anspruch 12, worin das Biegelast aufnehmende Rahmenelement (33) zumindest einen Verstärkungswulst (95, 96) aufweist, der an dessen Seitenwand (53) ausgebildet ist und sich längs zu der anderen Seitenwand (71) des Bodenrahmens (16) hin erstreckt.

Revendications

1. Structure de partie avant (10) d'une carrosserie de véhicule comportant une paire de cadres latéraux gauche et droit (11, 11), chacun des cadres latéraux avant comprenant :

un organe de cadre (31) portant une charge de compression, s'étendant dans une direction longitudinale de la carrosserie de véhicule et

présentant une ouverture en coupe généralement en U dans une direction latérale vers l'intérieur ou une direction latérale vers l'extérieur de la carrosserie de véhicule, l'organe de cadre portant une charge de compression de la coupe en U comportant une paire de parois supérieure et inférieure (35, 36) et une paroi latérale (37) s'étendant entre les parois supérieure et inférieure ; et

un organe de cadre (33) portant une charge de flexion partant d'une partie longitudinalement centrale (31c) de l'organe de cadre portant une charge de compression et incurvé vers l'intérieur vers une ligne centrale longitudinale (20) de la carrosserie de véhicule comme s'il s'étendait vers l'arrière de la carrosserie de véhicule, l'organe de cadre portant une charge de flexion présentant une ouverture en coupe généralement en U dans la direction latérale vers l'intérieur ou la direction latérale vers l'extérieur de la carrosserie de véhicule,

dans laquelle l'organe de cadre portant une charge de compression (31) comporte une partie d'extrémité arrière (41) incurvée vers l'intérieur vers la ligne centrale longitudinale de la carrosserie de véhicule,

caractérisée en ce que l'organe de cadre portant une charge de compression (31) comporte en outre au moins une première nervure de renforcement (48, 49) formée sur la paroi latérale (37) de la partie d'extrémité arrière de l'organe de cadre portant une charge de compression (31) et s'étendant dans la direction longitudinale de la carrosserie de véhicule, et au moins une seconde nervure de renforcement (69, 70) formée sur une partie de la paroi latérale (37) située vers l'avant de la partie centrale longitudinale (31c) de l'organe de cadre portant une charge de compression (31), la seconde nervure de renforcement (69, 70) s'étendant dans la direction longitudinale de la carrosserie de véhicule.

2. Structure de partie avant de la carrosserie de véhicule selon la revendication 1, dans laquelle chacun des cadres latéraux avant (11) comprend en outre un organe de cadre de capot (32) relié à l'organe de cadre portant une charge de compression (31) de manière à fermer une extrémité ouverte (44) de la coupe en U de l'organe de cadre portant une charge de compression pour ainsi former une section fermée entre l'organe de cadre de capot et l'organe de cadre portant une charge de compression et dans laquelle l'organe de cadre de capot comporte au moins une troisième nervure de renforcement (76, 77) agencée face à face avec la première nervure de renforcement (48, 49).

3. Structure de partie avant de la carrosserie de véhicule selon la revendication 1 ou 2, dans laquelle l'organe de cadre portant une charge de flexion (33) de la coupe en U comporte une paire de parois supérieure et inférieure (51, 52) et une paroi latérale (53) s'étendant entre les parois supérieure et inférieure, l'organe de cadre portant une charge de flexion comportant en outre au moins une quatrième nervure de renforcement (95, 96) formée sur sa paroi latérale et s'étendant dans la direction longitudinale de la carrosserie de véhicule.

4. Structure de partie avant de la carrosserie de véhicule selon la revendication 3, dans laquelle la première nervure de renforcement (47, 48) et la quatrième nervure de renforcement (95, 96) sont agencées face à face.

5. Structure de partie avant de la carrosserie de véhicule selon la revendication 1, incluant en outre un cadre de plancher (16) comportant une partie d'extrémité avant (16a) raccordée à une partie d'extrémité arrière (11b) de chacun des cadres latéraux avant (11), dans laquelle la partie d'extrémité arrière (41) de l'organe de cadre portant une charge de compression (31) est incurvée vers le bas et ladite au moins une première nervure de renforcement (48, 49) comprend une paire de premières nervures de renforcement supérieure et inférieure s'étendant à l'oblique vers le bas vers la partie d'extrémité avant du cadre de plancher et alignées longitudinalement avec les extrémités supérieure et inférieure (16b, 16c), respectivement, de la partie d'extrémité avant du cadre de plancher.

6. Structure de partie avant de la carrosserie de véhicule selon la revendication 5, dans laquelle la première nervure de renforcement inférieure (49) a un angle d'inclinaison supérieur à l'angle d'inclinaison de la première nervure de renforcement supérieure (48).

7. Structure de partie avant de la carrosserie de véhicule selon la revendication 5, dans laquelle chacun des cadres latéraux avant (11) comprend en outre un organe de cadre de capot (32) raccordé à l'organe de cadre portant une charge de compression (31) de manière à fermer une extrémité ouverte (44) de la coupe en U de l'organe de cadre portant une charge de compression pour ainsi former une section fermée entre l'organe de cadre de capot et l'organe de cadre portant une charge de compression, et dans laquelle l'organe de cadre de capot comporte une paire de troisièmes nervures de renforcement supérieure et inférieure (76, 77) agencées face à face avec la paire de premières nervures de renforcement supérieure et inférieure (48, 49), respectivement.

8. Structure de partie avant de la carrosserie de véhicule selon l'une quelconque des revendications 5 à 7, dans laquelle l'organe de cadre portant une charge de flexion (33) de la coupe en U comporte une paire de parois supérieure et inférieure (51, 52) et une paroi latérale (53) s'étendant entre les parois supérieure et inférieure, l'organe de cadre portant une charge de flexion comportant en outre une paire de quatrièmes nervures de renforcement supérieure et inférieure (95, 96) formée sur sa paroi latérale et s'étendant dans la direction longitudinale de la carrosserie de véhicule.

9. Structure de partie avant de la carrosserie de véhicule selon la revendication 8, dans laquelle la paire de premières nervures de renforcement supérieure et inférieure (47, 48) et la paire de quatrièmes nervures de renforcement supérieure et inférieure (95, 96) sont agencées face à face.

10. Structure de partie avant de la carrosserie de véhicule selon la revendication 1, incluant en outre un adaptateur (14) disposé sur une partie d'extrémité arrière (11b) de chacun des cadres latéraux avant (11), et un cadre de plancher (16) ayant une partie d'extrémité avant (16a) raccordée via l'adaptateur (14) à la partie d'extrémité arrière (11b) de chacun des cadres latéraux avant (11).

11. Structure de partie avant de la carrosserie de véhicule selon la revendication 1, incluant en outre un sous-cadre (21) disposé sous les cadres latéraux avant (11) et raccordé aux cadres latéraux avant (11), et un raidisseur (18) disposé sur chacun des cadres latéraux avant pour renforcer une partie du cadre latéral avant auquel le sous-cadre est raccordé.

12. Structure de partie avant de la carrosserie de véhicule selon la revendication 1, incluant en outre un cadre de plancher (16) comportant une partie d'extrémité avant (16a) raccordée à une partie d'extrémité arrière (11b) de chacun des cadres latéraux avant (11), le cadre de plancher présentant une coupe généralement en U incluant une paire de parois latérales (71, 72) et une paroi de fond (73) s'étendant entre les parois latérales, la paroi latérale (37) de l'organe de cadre portant une charge de compression (31) comportant une partie d'extrémité arrière (37a) raccordée à une partie d'extrémité avant (72a) de l'une des parois latérales (71, 72) du cadre de plancher (16) pour transmission d'une charge à partir de celui-ci vers ladite paroi latérale (72), l'organe de cadre portant une charge de flexion (33) de coupe en U comportant une paire de parois supérieure et inférieure (51, 52) et une paroi latérale (53) s'étendant entre les parois supérieure et inférieure, la paroi latérale (53) de l'organe de cadre portant une charge de flexion comportant une partie d'extrémité arrière (53a) raccordée à une partie d'extrémité avant (71a) de l'autre des parois latérales (71, 72) du cadre de plancher (16) pour transmission d'une charge à partir de celui-ci vers ladite autre paroi latérale (71), et la première nervure de renforcement (48, 49) de l'organe de cadre portant une charge de compression (31) s'étendant longitudinalement vers ladite paroi latérale (72) du cadre de plancher (16).

13. Structure de partie avant de la carrosserie de véhicule selon la revendication 12, dans laquelle l'organe de cadre portant une charge de flexion (33) comporte au moins une nervure de renforcement (95, 96) formée sur la paroi latérale (53) de celui-ci et s'étendant longitudinalement vers l'autre paroi latérale (71) du cadre de plancher (16).

Drawing